I have stayed only for a few days at Boos Mansion Residence. It's not exactly an apartment operated by an individual, it's operated by a hotel. That being said, it comes with all hotel-like services, every day room cleaning and complimentary water, so it's a nice add-on. The staff is very friendly and helpful, the apartment is clean and spacious and it also comes with a balcony. It's in walking distance from Ekkamai BTS making it easy to get around BKK.

The only thing I noticed was that WiFi was disconnecting from time to time, which is also the only reason I'm giving 4 stars, otherwise I would give 5. Personally, I would not chose Boss Mansion for a business trip, but for leisure is perfect.

Don't use Google Maps to get to the hotel, as it will show you a different location, about 2km away. A lot of taxi drivers will not speak English, so best thing is to ask Boss Mansion to send you a message with the directions in Thai and show that to the taxi driver.